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Beechcraft 60 Duke

 

beech_60
A60


Beech entered the field of pressurised general aviation aircraft following a first flight of the Beech Model 60 Duke on 29 December 1966. The Duke was intended as a luxury four/six-seat aircraft, and overall configuration was similar to other Beech twins. It was intended for operation at higher gross weights and had strengthened landing gear, and much more powerful Avco Lycoming TIO-541-E1C4 380-hp turbocharged engines.


The Duke uses turbo bleed air to obtain 4.6 psi cabin pressure, which will maintain a 10,000-foot cabin altitude all the way to 24,800 feet. Two separate baggage compartments in the nose and aft fuselage handle 500 and 315 pounds of lug-gage, respectively. The spacious Duke cabin provides a center aisle separating the seats, plus dividers between the flight deck and passenger cabin. A 20 per cent increase in range and new land-ing lights on the retractable gear were the changes for 1976. As an option, the pressurized twin can hold up to 232 gallons of usable fuel by adding wet wing tips. This boosts the fuel load by 90 gallons over the 142 gallons standard fuel load. The previous option allowed a maximum of 202. In 1977, the Duke advertised a higher cruise speed, improved exterior lighting and a standard Collins avionics package. In 1980, a Hoskins fuel-flow system indicates flow in gallons and pounds per hour, plus fuel remaining. Timing modes calculate flying time remaining and elapsed time since engine start.

 

Beech-A60
A60 Duke

 

Only two revised versions of the original Model 60 appeared during the production run, the Model A60 and Model B60 introduced in 1971 and 1974 respectively. The first provided a 23kg increase, in maximum take-off weight, the second a slightly larger cabin and increased fuel capacity. Such an aircraft was by no means cheap and, by American standards, was built in comparatively small numbers, with a total of 596 completed by the end of production in 1983.

BE-A60 Duke
Engines: 2 x Lycoming TIO-541-EIA4 6-cylinder turbocharged, 380 hp each.
Length: 33 ft 10 in.
Wingspan: 39 ft 3 in.
Speed: 286 mph.
Ceiling: 31,000 ft.
Range: 973 mls.

BE-B60 Duke
First built: 1968.
Engines: Lycoming TIO-541-E1C4, 380 hp each.
TBO: 1600 hrs.
Props: Hartzell 3-blade, 74-in, constant‑speed, full‑feathering.
Seats: 4/6.
Wingspan: 11.97 m / 39 ft 3 in
Length: 10.31 m / 33 ft 10 in
Height: 3.76 m / 12 ft 4 in
Wing area: 19.78 sq.m / 212.91 sq ft
Wing aspect ratio: 7.2.
Cabin length: 11 ft 10 in / 3.61 m
Cabin width: 4 ft 2 in / 1.27 m
Cabin height: 4 ft 4 in / 1.32 m
Maximum ramp weight: 6819 lbs.
Maximum takeoff weight: 6775 lb / 3073 kg
Empty weight equipped: 4235 lb / 1921 kg
Standard empty weight: 4425 lbs.
Maximum useful load: 2394 lbs.
Maximum landing weight: 6775 lbs.
Wing loading: 31.8 lbs/sq.ft.
Power loading: 8.9 lbs/hp.
Maximum usable fuel: 232 USG/1392 lbs.
Best rate of climb: 1,601 fpm @ 120 kts.
Climb gradient: 801 ft/nm.
Rate of climb @ 8,000 ft: 1460 fpm.
Certificated ceiling: 30,000 ft.
Service ceiling: 30,800 ft / 9390 m
8000ft cabin alt @: 21,600.
Maximum single-engine rate of climb: 307 fpm @ 110 kts.
Single-engine climb gradient, sea level: 165 ft/nm.
Single-engine service ceiling: 15100 ft.
Maximum speed: 246 kts.
Max cruise 79% pwr 25,000ft/7620m: 241 kt / 278 mph / 447 kph
Cruise @ 65% pwr @ 8,000ft: 185 kts.
Cruise @ 65% power @ 18,000ft: 201 kts.
Fuel flow @ 65% pwr @ 18,000 ft: 223 pph.
Endurance at 65 % pwr @ 18,000 ft: 6 hrs:
Range 45% 15,000ft/4750m opt fuel 45min res: 1023 nm / 1177 mi / 1893 km
Range 75% 25,000ft/7620m opt fuel 45min res: 837 nm / 963 mi / 1550 km
Stalling speed clean: 81 kts.
Stalling speed gear/flaps down: 73 kts.
Turbulent-air penetration speed: 160 kts.
Nose baggage capacity: 50 lb / 226 kg / 32 cu.ft / 0.91 cu.m
Cabin rear capacity: 315 lb / 143 kg / 28.25 cu.ft / 0.80 cu.m

 

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